2008 Pontiac G5 Q&A
2008 Pontiac G5 Question: Why will my fan not kick on when my engines gets hot?
Not sure what engine you have so this is for a 2.2 - Engine coolant fan should come on at low speed when engine temperature is 223 degrees or A/C high side pressure is 190 PSI. - High speed fan should operate at 230 degrees or 240 PSI on the A/C high pressure. Radiator cap has to hold good pressure and be on the system when testing or coolant will spit out of the filler neck. The best way to test is to have a scanner hooked into the computer system and read the actual temperature that the coolant sensor is giving the PCM - Justin Case Auto